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The Scoville Heat Unit measures the heat factor chilies from different plants. Depending on the plant, its source and the brand, the SHU of Indian red chili powder ranges from 48,000 SHU (which is relatively mild) to 72,000 SHU (which is hot).

Having said this, something as beneficial as capsaicin does not come without any trade-offs. Producing capsaicin takes a lot of energy, which is why some peppers are not spicy. In some cases it makes more sense to make a lot of fruit with less or no capsaicin, thus producing more seed, and getting offspring by overwhelming predators and plagues by sheer volume.